DMG Mori ULTRASONIC 60 precision

The DMG MORI ULTRASONIC 60 precision is built for grinding and milling on one machine, in materials such as ceramic and glass, and it states its accuracy up front: positioning accuracy of 5 µm as standard. Travels are 600 mm (23.6 in) in X and Y and 510 mm (20.1 in) in Z, and the swivel rotary table carries up to 300 kg (661.4 lb).

The basis of that accuracy figure is structural and thermal. DMG MORI lists a monolithic machine bed, massive castings and wide guideways, and a cooling concept that includes precision cooling of the linear guides in X, Y and Z as standard. On a machine that grinds, heat and stiffness decide whether the last few microns hold over a shift, so it helps that these items come with the standard machine instead of a package.

The swivel rotary table tilts from -35° to +110° and has a direct drive C-axis with max. 300 rpm. On the 5-axis version, ULTRASONIC axialGRINDING is standard and uses that C-axis speed for circular grinding operations, with a B/C tolerance of 2 seconds of arc. That makes the machine a candidate for round ground features that would otherwise go to a separate grinder.

The spindle is a speedMASTER with 20,000 rpm and HSK 63. The tool changer has 60 slots as standard and 120 as an option, and every second slot can be assigned an ULTRASONIC actuator, which sets how many ultrasonic tools can sit in the magazine at once. The footprint is given as 7.0 m², and GREENMODE is listed with 21 % lower energy consumption than the predecessor.

One figure to query: the technical data gives a maximum workpiece diameter of 650 mm (25.6 in) and a height of 450 mm (17.7 in), while the Highlights speak of a workspace up to Ø 600 mm.